Cartridge for grease guns



1 192 July 7 J. F. BROMMER CARTRIDGE FOR GREASE GUNS' Filed July 10. 1924 INVENTOR ATTORNEYS Patented July 19, 1927.

UNITED STATES PATENT OFFICE.

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Application me m 10, 192-1. Serial 1%. 725,219.

The object of my invention is to provide a grease gun cartridge as an article of manufacture for use in connection with grease ns of ordinary'construction, whereby the filling of the grease gun may be attained without the usual liability of smearing the grease over the hands and clothing of the dealer or user, or over the gun; wherebythe user may keep an ample supply of an approved or suitable grease on hand in convenient form for immediate use; whereby the dealer may also keep a supply on hand for quick and ready sale; and whereby the cartridge shell may be withdrawn from the T barrel of the gun b the plunger by providin the cartridgesl iell with means adapted to he engaged by the plunger in its rearward movement, said means permitting the forward movement of the plunger. past the same.

A practical embodiment of my invention is represented in the accompanying drawin n which ig. 1 represents the. grease gun cartridge in erspect1ve.

ig. 2 represents a lon 'tudinal central section through the cartri ge showing the end caps removed from the shell, preparatory to the insertion of "the cartridge into the grease gun. I v

Fig. 3 represents the cartridge in lpng1tu-. dinal central section in position for use, the grease gun being shown 1n dotted lines.

Fig. 4 represents a similar view showing the plunger in the act of withdrawing the cartridge shell from the gun barrel after the grease has been forced from the cartridge.

The grease gun comprises the continuous barrel 1, the nozzle end 2, the plunger end 3, the plun r 4 and the screw-threaded plunger sha 5. y

The ease cartrid e comprises'the tubular she 6 open at hot ends and the removable end caps 7 and 8. The shell and end caps may be made of any suitable material.

for containing and retaining the grease 9.

When it is desired to use the cartridge, the

end caps 7 and 8 are removed from the shell 6. Either the nozzle end or plunger end of 1 thegrease gun is removed. The cartridge gun shell containing the grease is then inserted into the barrel 1 of the grease gun.

. After the shell has been shoved into its position within the grease gun barrel the nozzle end or the pl 7 end, as the case may be. is again attach to the gun barrel. To expel the grease the plunger 4 may be moved orwardly along withinthe shell. The shell is preferably made of very thin sheet material so that the usual plunger may be emplolyed.

he means which I have shown for permitting the empty shell to be withdrawn from the gun barrel by the plunger is as folows:

I distort the shell to produce one or more, in the present instance two projections having a fiat inclined portion 10 toward the rear end of the shell and a shar inclined portion 11 toward the front end 0 the shell. This form of rojecting means will permit the plunger to be moved forwardly past the projectin means to expel the 1 grease from the cartrid e shell and thereby from the gun but w1l cause the plun er to engage the projecting means when the plunger is moved rearwardly and thereby permit the plunger to withdraw the shell from the gun arrel when the plunger end 3 of the gun is removed from the barrel.

It is obvious that one or more of these inward projections may be provided as found desirable and it is preferable that these projections be slightly yielding so as to permit the readypassage of the plunger forwardly by the same and to present a resistance to the rearward movement of the plunger by the same, sufiicient to permit the plunger to withdraw the shell from the gun barrel when the plunger end of the gun is removed.

From the above description it will be seen that I have provided a very simple and effective means for removing the empty 'cartridge shell from the gun barrel.

It is evident that various forms of inward projections may be provided, hence I do not wish to limit myself to the particular form herein shown and described, but

What I claim is V 1. A grease gun cartridge comprising a tubular shell having removable end caps and adapted to be inserted into the gun barrel with both end caps removed, said shell being adapted to slidably receive the gun plunger and having means located in position to be engaged by the'plunger for withdrawing the I shell from the barrel.

2. A grease gun cartridge comprising a tubular shell having removable end caps and adapted to be inserted into the gun barrel with both end cas removed, said shell being adapted to slida 1y receive the gun plunger and having yieldin means located in position to be engaged y the plunger for with drawing the shell from the barrel.

3. A grease gun cartridge comprising a tubular shell having removable end caps and adapted to be inserted into the gun barrel with both end caps removed, said shell being adapted to slidably receive the gun plunger and having a plurality of projections located in position to be engaged by the plunger for withdrawing the shell from the barrel.

4. A grease gun cartridge comprising a tubular shell having removable end caps and adapted to be inserted into the gun barrel with both end caps removed, said shell being adapted to slidably receive the gun plunger and having a plurality of yielding projections located in position to be engaged by the plun er for withdrawing the shell from the barre L r i 5. A grease gun cartridge comprising a tubular shell having removable end caps and adapted to be inserted into the gun barrel with both end caps removed, the shell being adapted to slidably receive the gun plunger, the walls of saidshell being distorted to form a plurality of projections located in position to be engaged by the lunger for withdrawing the shell from the arrel.

6. A grease gun cartrid e comprising a tubular shell having remova 1e end ca s and adapted to be inserted into the gun and with both end caps removed, the shell being adapted to slidably receive the gun plunger, the Walls of said shell being distorted to form a plurality of yielding projections lo cated in position to be engaged by the plunger for withdrawing the shell from the barreL- In testimony, that I claim the foregoing as my invention, I have signed my name this 18th day of une 1924.

JOHN FREDERICK BROMMERQ 

